*{
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}
section{
  position: relative;
  width: 100%;
  min-height: 100vh;
  background: url(bg.jpg);
  background-size: cover;
}
section::before{
  content: '';
  position: absolute;
  top:0;
  left: 0;
  width: 100%;
  height: 100%;
  background: url(splash.jpg);
  background-position: center;
  mix-blend-mode: screen;
  background-size: 2200px;
}